QARGHULIA, Iraq — Despite persistent sectarian tensions in the Iraqi government, war-weary Sunnis and Shiites are joining hands at the local level to protect their communities from militants on both sides, U.S. military officials say.

In the last two months, a U.S.-backed policing movement called Concerned Citizens, launched last year in Sunni-dominated Anbar province under the banner of the Awakening movement, has spread rapidly into the mixed Iraqi heartland.

Of the nearly 70,000 Iraqi men in the Awakening movement, started by Sunni Muslim sheiks who turned their followers against Al Qaeda in Iraq, there are now more in Baghdad and its environs than anywhere else, and a growing number of those are Shiite Muslims.

Commanders in the field think they have tapped into a genuine public expression of reconciliation that has outpaced the elected government's progress on mending the sectarian rift.

"What you find is these people have lived together for decades with no problem until the terrorists arrived and tried to instigate the problem," said Lt. Col. Valery Keaveny, commander of the 3rd Battalion, 509th Airborne unit in the Iskandariya area south of Baghdad. "So they are perfectly willing to work together to keep the terrorists out."

As late as this summer, there were no Shiites in the community policing groups. Today, there are about 15,000 in 24 all-Shiite groups and 18 mixed groups, senior U.S. military officials say. More are joining daily.

Here in Qarghulia, a rural community east of Baghdad, the results are palpable. Killings are down dramatically and public confidence is reviving.

"Sunnis-Shiites, no problem," said Obede Ali Hussein, 22, who stood at a checkpoint built by the U.S. Army along the Diyala River. "We want to protect our neighborhood."

For commanders in areas where Sunni-Shiite warring had brought normal life to a standstill, the unexpected flowering of sectarian cooperation has proved a boon.

"I couldn't do it without them," said Capt. Troy Thomas, whose 1st Cavalry unit is responsible for securing the Qarghulia area.

Baghdad in 2000: "A woman known as Um Haydar was beheaded reportedly without charge or trial at the end of December 2000. She was 25 years' old and married with three children. Her husband was sought by the security authorities reportedly because of his involvement in Islamist armed activities against the state. He managed to flee the country. Men belonging to Feda'iyye Saddam came to the house in al-Karrada district and found his wife, children and his mother. Um Haydar was taken to the street and two men held her by the arms and a third pulled her head from behind and beheaded her in front of the residents. The beheading was also witnessed by members of the Ba'ath Party in the area. The security men took the body and the head in a plastic bag, and took away the children and the mother-in-law. The body of Um Haydar was later buried in al-Najaf. The fate of the children and the mother-in-law remains unknown."